下列波长范围中,对植物生长发育没有影响的光是()。
A、100~300nm;
B、500~1000nm;
C、300~500nm;
D、1000~2000nm;
参考答案:D
何谓“五声”服务?
根据句意、首字母及汉语提示补全单词。
1. W _____ to the Summer Palace!
2. _____ (为什么) do you like dolphins?
3. The elephants like to eat g _____ .
4. The _____ (狮子) is very unfriendly, I don't like it.
5. We know t _____ eat meat.
6. Mary is k _____ of shy.
7. Koalas are very c _____ Everyone likes them very much.
8. Let's go to see the elephants f _____ .
9. I like the monkeys because I think they are very i _____ .
10. P _____ are from China. Everyone in the world likes this kind of animal.